JPS62131064A - Electrically conductive resin composition - Google Patents

Abstract

PURPOSE:To enable the desired electrical conductivity to be imparted to resins even when the amounts of electrical fillers to be added are greatly reduced, by adding a combination of an electrically conductive filler and a titanium coupling agent to a resin. CONSTITUTION:This electrical conductive resin compsn. contains an electrically conductive oxide filler and 0.10-10wt% (based on the amount of the oxide filler) titanium coupling agent. Examples of the titanium coupling agent are compds. of formulas I, II, III (wherein R is a lower alkyl; R<1>, R<2> are each a lower alkylene).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conductive resin. More specifically, the present invention relates to a conductive resin composition that has good conductivity even when a small amount of conductive filler is mixed into the resin.

[Conventional technology]

Although Itil resin is used as storage containers for ICs and LSIs, there is a demand for antistatic resins to prevent ICs and LSIs from being destroyed by static electricity discharge. There is also a great demand for resins that are less likely to attract dust due to electrostatic charge as materials for clean room wall materials, floor materials, clothing, etc. Therefore, it is widely practiced to impart conductivity to resins. In order to impart conductivity to the resin, it is common to include an inorganic material having conductivity (conductive filler). As this conductive filler, metal, fiber such as carbon, or
Powders and various oxides having conductivity are known.

[Problem that the invention seeks to solve]

In order for a resin containing a conductive filler to exhibit conductivity, it is necessary to fuse the conductive fillers together.

For this purpose, it is necessary to include a considerable amount of conductive filler. For example, zinc oxide-based and titanium oxide-based conductive fillers have the necessary conductivity (surface resistance 1
010Ω/mouth), the content is required to be 50% by weight or more. This causes problems such as the resin becoming brittle, its strength decreasing, and its specific gravity increasing.

Furthermore, when a resin containing a conductive filler is processed into fibers, for example, there are problems such as clogging of nozzles. In order to solve this problem, the use of other additives together with the conductive filler has been considered, but no additives have been known that would be sufficiently effective.

[Means for solving problems]

The present inventors have found that by adding a combination of a conductive filler and a titanium coupling agent to a resin, a predetermined conductivity can be imparted to the resin even if the amount of the conductive filler added is significantly reduced. The present invention is based on the above knowledge, and solves the conventional problems such as a decrease in resin strength, an increase in specific gravity, and a decrease in workability by reducing the amount of inorganic additives (conductive filler) in the resin. be.

[Structure of the invention]

According to the present invention, the conductive material contains an oxide conductive filler and a titanium coupling agent, and the titanium coupling agent is contained in an amount of 0.10 to 10% by weight based on the oxide conductive filler. A synthetic resin is provided.

The resin composition of the present invention contains a titanium coupling agent together with an oxide conductive filler. The titanium coupling agent of the present invention is represented by the following formula, for example.

R-0-Ti-(0-R1-NHJaR-0-Ti-
[0-R'-NH-R2-NH2)3R-0-Ti-[
0-R'-NH-R)3 where R is lower alkyl and R1 and R2 are lower alkylene.

Up until now, titanium coupling agents have been widely used as dispersants for inorganic fillers, but very few have investigated their conductivity.

The present invention uses the titanium coupling agent described above to improve the conductivity of a resin.

The titanium coupling agent of the present invention itself has no electrical conductivity, but is effective when used in combination with an oxide conductive filler. This is because a titanium coupling agent is coordinated around an oxide conductive filler, and when electricity flows through the conductive filler, electron movement is induced in the titanium coupling agent that has an amino group in the vicinity of the conductive filler. This is thought to be due to the easy flow of electrons from the filler to the titanium coupling agent to the conductive filler. Therefore, the amounts of the conductive filler and titanium coupling agent do not need to be so large that they come into contact with each other, and the amount of the conductive filler added can be significantly reduced. The amount of the titanium coupling agent added varies depending on the degree of conductivity to be obtained, but may be 0.1 to 10% by weight based on the oxide conductive filler. 0.
If it is less than 1% by weight, the amount of titanium coupling agent that approaches the conductive filler will be small, resulting in insufficient conductivity. On the other hand, even if the titanium coupling agent is added in an amount of 10% by weight or more, the effect does not change much.

Next, as the conductive filler, an oxide conductive filler is used. In particular, zinc oxide doped with l or titanium oxide coated with SnO□ doped with sb is white, and when added to a resin, the color tone can be adjusted by adding other pigments or dyes. In addition to the above-mentioned oxide conductive fillers, for example, black titanium oxide powder, conductive potassium titanate fibers, etc. can be used as oxide conductive fillers that are recognized to be effective.

The type of resin containing the titanium coupling agent and oxide conductive filler is not limited, for example, acrylic resin,
A wide variety of materials such as polypropylene resin, vinyl chloride, polyester, and nylon can be used.

Incorporation of the oxide conductive filler into the resin can be achieved by kneading the conductive filler into the resin in a heated state or at room temperature using a two-roll, three-roll, or injection molding machine. The titanium coupling agent may be added at the same time as the resin is kneaded, or the titanium coupling agent may be attached to the oxide conductive filler in advance and then kneaded in as described above. This method is more effective in improving uniformity.

Further, a conductive coating film can be obtained by mixing a conductive filler into an organic paint using a homomixer, a dipper, a ball mill, a sand mill, etc., and applying this paint onto the surface of a base material. At this time, if a titanium coupling agent is added and mixed at the same time as the conductive filler, the conductive resin of the present invention can be obtained, and the content of the conductive filler can be reduced.

〔Effect of the invention〕

The amount of conductive filler i contained in the conductive resin of the present invention can be significantly reduced compared to conventional resins. For example, Table 1 below
If no titanium coupling agent is added as shown in Nα12 of By adding a ring agent, a surface resistance of 2X10' can be obtained by just mixing 20% by weight of a conductive filler (Nα2), and the amount of conductive filler mixed can be reduced to more than half. The amount added may be very small.In this way, the conductive resin of the present invention does not impair processability because the amount of inorganic substances (conductive filler and titanium coupling agent) mixed into the resin is small.For example, the conductive resin of the present invention does not impair processability. Even when the spinning method is used, spinning can be performed without clogging the nozzle.

Further, the present invention uses an oxide as the conductive filler. In particular, those using AQ-doped zinc oxide or titanium oxide with sb-doped SnO2 coating are white, and when added to the resin, the color tone can be adjusted by adding other pigments or dyes. The resin according to the above is suitable as a conductive coating 1 which requires white color, such as a conductive layer of electrostatic copying paper.

Of course, it can be used for a wide range of other purposes.

[Examples and comparative examples]

Example 1 Using an acrylic paint (manufactured by Kansai Paint Co., Ltd., Acrylic) and toluene, the solid content of the acrylic resin was adjusted to 30%, and white conductive powder (Sb-doped SnO□covered i'fT) was added to the paint.
After mixing in a ball mill for 2 hours, this was applied to a thickness of about 100 μm (after drying) on a polyester film, and its surface resistance was measured. The results are shown in Table-1.

Example 2 Zn oxide conductive powder (Al-doped Z
C)1. -〇-Ti-[0-C2H4-N11
．． ] The present invention was carried out under the same conditions as in Example 1, except that Example 3 was used.

The results are shown in Table-2.

Claims (1)

[Claims] 1. A conductive resin composition containing an oxide conductive filler and a titanium coupling agent, and containing the titanium coupling agent in an amount of 0.10 to 10% by weight based on the oxide conductive filler.